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  <title>Document</title>
</head>

<body>
  <script>
    // 二维数组
    var arr = [
      [3, 4, 5],
      [1, 2, 3],
      [7, 8, 9]
    ]
    // 二维数组的访问
    console.log(arr[1][1]);
    console.log(arr[2][1])
    // 多维数组
    var arr3 = [
      [
        [1, 2, 3], [5, 6], [7, 8]
      ],
      [
        [1, 2, 3], [5, ["x", "y", ["j", 1, 2]], "11",], [7, 8]
      ],
      [
        "dd"
      ]
    ]
    console.log(arr3[1][1][1][2][0])
    //



  </script>
</body>

</html>